Grinding machine and other machine tool



Max-ch 4; 1930. A. H. IORCUTT in. 1,749,258

GRINDING MACHINE AND OTHER MACHINE TOOL Filed Jam 16. 1929 '2Sheets-Sheet 1 March 4, 1930. A. H. ORCUTT E'i'AL 1, 5

GRINDING MACHINE AND OTHE R MACHINE TOOL Filed Jan. 16, 1929 2Sheets-Sheet 2 Patented Mar. 4, 1930 like purposes, the kind in which areciprocatory slide carry- UNITED v STAT ARTHUR nir'crrcocx oncu'rr y inall positions. 15 utilization of a balance weight for the. dou- RAM,ENGLAND ES PATENT oFFicE ANDJ'OI-IN WILDSMITH SNARRY, OF BIRMINGHAM,ENGLAND, ASSIGNORS TO THE GEAR GRINDING COMPANY LIMITED, OF BIRMING-GRINDING MACHINE AND OTHER MACHINE TOOL Application filed January 16,1929, Seria1 No. 332,965, and in Great Britain January 24, 1928.

Y 5; 5 "This invention relates to grinding machines for grinding theteeth of gear wheels and for and to other machine tools of ing thegrinding Wheel or other tool is mount ed on a vertical guide.

. I The objectof the invention is to provide improved means for holding--in contact with the vertical guide. v, .7 The invention comprises theemployment of a weight connectedto the slide in such a manner that itholds the slide against the guide withv substantially uniform pressureIn particular theinvention comprises the ble purpose ofcounterba'lancingthe weight 7 of the slide and holding the slideagainstthe guide- I Preferably the invention comprises the provision on theslide of a bell crank or other [suitablelever, one end beingattached .bya

chain or the like to a counter-weightand the other end connected by aradius rodto a sta ti'onary part of the machine, the arrangement beingsuch that the counter-weight causes the with substantially uniformplanatory drawings igure 1 is a sidefelevationand Figure 2.

' a plan of a machine for grinding the teeth ofgear wheels and providedwith this in vention.

In the example shown in the drawings, the

and against this abuts a vertically grinding wheel'c.

I by a rope 71 chain or the like passing over suit- 01? bell cranklevers able guide pulleys e. 'In the arrangement i1- lustrated a singlerope. passes over the two pulleys e mounted on the upper end of the theslide firmly rocating slides, slide and which haveiormerly been used inhigh class each of the levers, and the action of the weight thereon issuch that it tends to rock the other arm in the direction away from theguide. The second arm of each lever is connected to the outer end of aradius rod it whose opposite end is pivoted to any suitable stationarypart of themachine. Owing to the constraint exerted by the radius rod onthe lever, the counter-weight, in addition to balancing the slide, alsopulls the slideagainst the guide and so insures that the slide is heldfirmly against the guide in all positions. Ob-

viously thesame effect can be obtained by att-aching a single end of arope to a single bell crank lever on they guide. An advantage orconvenience is' afforded in the use of a double rope in that the pull onthe slide can be exerted at two laterally separated points.

Alternatively, the rope or the like connected to the counter-weight maybe connected directly to the slide in such a manner that it occupies anoblique position relatively to the slide and guide. The pull of thechain or the like then has two components, one vertical beused, one forcounter-balancing the slide and the other for holding itagainst theguide.

able to adopt in ByLthis invention we are machines provided withvertically recipguide constructions machines having horizontallyreciprocatory slides, and the necessity for the slide retaining stripscommonly employed in vertical ma- The weight oft-he slide iscounter-balanced 1 1 by a weight cl which is attached to the slidechines is obviated. I

Having thus described our invention what we claim as new and desire tosecure by Letters Patent is In grinding and other machine tools, the

combination comprising a vertical guide, a slide movable on said guide,a bell crank lever pivoted on the slide, a balance weight, flexiblemeans for securing the balance weight to one end of the bell cranklever, and a radius rod having one end attached to a fixed pivot,

the other end of the radius rod being attached to the other end of thebell crank lever, substantially as described.

In testimony whereof We have signed our names to; this speclfication.

ARTHUR HITCHCOGK ORC UTT."

JOHN WILDSMITH SNARRY.

